/**
 * $RCSfile$
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smack.filter;

import org.jivesoftware.smack.packet.Packet;

import java.util.List;
import java.util.ArrayList;

/**
 * Implements the logical AND operation over two or more packet filters. In
 * other words, packets pass this filter if they pass <b>all</b> of the filters.
 * 
 * @author Matt Tucker
 */
public class AndFilter implements PacketFilter {

	/**
	 * The list of filters.
	 */
	private List<PacketFilter> filters = new ArrayList<PacketFilter>();

	/**
	 * Creates an empty AND filter. Filters should be added using the
	 * {@link #addFilter(PacketFilter)} method.
	 */
	public AndFilter() {

	}

	/**
	 * Creates an AND filter using the specified filters.
	 * 
	 * @param filters
	 *            the filters to add.
	 */
	public AndFilter(PacketFilter... filters) {
		if (filters == null) {
			throw new IllegalArgumentException("Parameter cannot be null.");
		}
		for (PacketFilter filter : filters) {
			if (filter == null) {
				throw new IllegalArgumentException("Parameter cannot be null.");
			}
			this.filters.add(filter);
		}
	}

	/**
	 * Adds a filter to the filter list for the AND operation. A packet will
	 * pass the filter if all of the filters in the list accept it.
	 * 
	 * @param filter
	 *            a filter to add to the filter list.
	 */
	public void addFilter(PacketFilter filter) {
		if (filter == null) {
			throw new IllegalArgumentException("Parameter cannot be null.");
		}
		filters.add(filter);
	}

	public boolean accept(Packet packet) {
		for (PacketFilter filter : filters) {
			if (!filter.accept(packet)) {
				return false;
			}
		}
		return true;
	}

	public String toString() {
		return filters.toString();
	}
}
